Got my Osmo the other day. So far im pretty happy with it.....EXPECT using the external mic jack im getting an AWFUL high pitch noise at about 14,000hz for older ears i guess that doesnt matter but for me its annoying. check it out in my First impressions video on youtube.

Note: Ive been using the Mic for a while now witout issue. I confirmed by testing side by side that its not my Mic system.

Sorry for the fan noise of OSMO, we will try to improve it in the future. For now, you can use the external MIC to record the sound and try to place the MIC away form gimbal in order to reduce the input of noise. About the stabilization of the scene when you're walking, the gimbal can't counteract the pace of shaking.  Hope to see your works shooting by OSMO here.